[ceph-users] Re: advice needed for sizing of wal+db device for hdd

[Adrian Sevcenco]

-------- Original Message --------
Subject: [ceph-users] Re: advice needed for sizing of wal+db device for hdd
From: Janne Johansson
To: Adrian Sevcenco
Date: 9/19/2025, 8:58:46 AM

I will go with 5 osds for one nvme (6.4 TB nvme -> 1280 GB/OSD which for 26TB hdd 
-> 4.92% db size)
and hope for the better .. if there are problems in commissioning i will try 
with 4 osds/nvme

We do 6 OSDs to an nvme in some places where we do 12 HDDs per OSD
host, and it works wonders compared to no flash DB/WAL device at all.
We are aware of that a broken nvme will be as if half a host failed,
but we still hope to successfully manage a complete host failure, so
half a host should not be a huge problem in that scenario.

Thank you sharing your experience!!
It's really useful to me!

Adrian

smime.p7s
Description: S/MIME Cryptographic Signature

_______________________________________________
ceph-users mailing list -- ceph-users@ceph.io
To unsubscribe send an email to ceph-users-le...@ceph.io